Pressure gauge



INVENTORS:

w gy f- WITNESSES;

Patented pr. l0, 1923:

MAXIMILIAN CHARLES SCHWEINERT, OF HENRY P. KRAFT, OF BROOKLYN, NEW

WEST -HoBoKEN, NEW JERSEY, y AND YORK, ASSIGNORS TO A. SCHRAD-ERS SON, INC., OF NEW YORK, N. Y., ACORPORATION OF NEW YORK.v

PRESSURE GAUGE.

Appucationmed'Mareh 28,1910. serial No. 552,111.

To all ulzom if may concern."

Be it known that we, MAXIMILIAN CHARLES SCHWEINERT, residing-in lVest Hoboken, in the county of Hudson and'State of New Jersey. and HENRY P. Kimm, residing in the borough of Brooklyn, county of Kings, city and State of New York, both citizens of the VUnited States7 have jointly inventedcertain new and useful Improvements-in Pressure Gauges, of which the 'following-1s a specification.

This invention relates to pressure gauges and aims to provide `certain improvements therein. p v v' The chief object of the present invention is to provide a gauge which is adapted to be temporarily applied to a valve shell of a pneumatic tirelor other container o-f.a1r or gasses under pressure. and to register the pressure therein insuch'mannerthat the pressure can be` read after the gauge .1s removed from the valve. .The invention 1n its preferred form comprises a pressure member which is adapted Vto respond to the pressure [within the tire combined with an indicating member which is moved to its various indicating positions by the pressure member. The pressure member is adapted to return to its initial position lwhen the pressure is relieved. while the indicating member is adapted to be retained in 'its indi-` in the tire, the air under pressure being sud-' denly admitted to the gauge 'is apt, by its momentum, to move the pressure member to a point beyond that which corresponds to the pressure within the tire. In a gauge which is intended to remain upon the tire valve until the pressure 'is read this opera- "l tion is not so objectionable since when the momentum of the entering stream of 'air has exhausted itself the registering plunger will retire to approximately its proper indif eating position. either the plunger or the indicating member is held in the outermost position to which it is moved in order to permit reading of the pressures after the gauge is removed, it becomes very desirable that the pressure memthe air chamber an trate the vwhich is screwed a hollow lVith a gauge4 in whichY ber should not advance beyondV the Apoint-y corresponding to the pressure Within the tire.` ur invention prevents this over-'indicating or Jumping ot' the pressure member, preferably by the provision of an enlarged air chamber located i advanceof the pressure member and having avery small opening leading therefrom sothat the momentum ot the air is exhausted. or nearly so, Within d the pressure affecting the pressure member is more or less graduto thev point of maximum ally increased up l pressure in the tire. Our invention includes vother features of improvement which Willbe hereinafter pointed'out. VAReferring 'to the drawings whichindicate one form of the invention.

Figure 1 is a diametrical. section of ja gauge embodying our invention.

Fig 2 is a s inlsection.

piff. Figi Fig. 4 is a bottom view of the gauge. Figs.' 5-9 are detail views of several forms of` packing. y

Referring to the drawings which illuspreferred embodimentof the invention. let A indicate a shell Vor casing having an enlarged lower end a. Within plug b having notches c or other means for engaging a suitable tool. The plug b contains a circular block ot' rubber or other packing material l having a central aperture @said block I constituting a press-0n seat for the gauge. Above the packing is a metal disc. which has fixed to its central part a tubular extension or ldepressor g slotted on its lower end4 in such manner that whenthe device is passed over the end. of a tire valve the eX- tension y will depress the deiating pin of the valve so that the air within the tire will pass through the slotsv in. the extension up` through the bore thereof into an expansion chamber B. f

The provision of the chamber B is an important feature of the present invention. It provides a space pacity into which! the incoming stream of air under high pressure -is lem-andA Within which such stream loses its momentum to a great extent. In the upper part of the vchamber B is a disc k having' a small openide. elevation thereof partly of relatively large caing z' leading to the presure chamber C. The latter is formed essentially of a tube j soldered or otherwise connected at its lower end to the disc L. lVithin this tube moves the pressure responsive member D which at its lower end is constructed as a piston provided with a packing-'. The upper end of the presure kmember D is enlarged at l to form a head to which is connected the loading spring m which is also connected at its lower end to the tube j as shown. The result of this construction is that the pressure member D rises against the tension of the spring. until the pressure is relieved (as by removal of the gauge from the valve), whereupon it is retracted to its lowermost or zero position. l

The bottom Iofthe piston may be packed in any suitable way, and in certain cases the cylindrical y pressure member D may fit nicely within the tube jso that an independent packing is unnecessary. IVeprefer, however, to provide a packing which will not introduce any undesirable friction, so that the movements of the pressure member D may be as little affected as possible. In Figures 1 and 3 we have shown the packing tas a ring of leather encircling a pin or post n having at its outer end a. perforated plate 0, thev perforations of which lead to an annular space within the packing. When the air is admitted into the pressure i chamber C it `passes through the perforations o andiexpands the packing It suticiently to make a reasonably tight joint between the parts.

An important feature of the invention, is the provision of an indicating and registering device, which while moved by the pressure member to its varying positions, will nevertheless retain its indicating position after the gauge is removed from the tire valve and after the plunger by the relief of pressure beneath it returns to its zero position. Any suitable device may be provided for this purpose, but we prefer the construction shown, wherein a member E is provided which slides withinl the casing.

or compactness the member E is preferably formed as' a cap orsleeve within which the -ressure member Dl extends so that its hea presses against the interior of the upper end of the sleeve. The cap or sleeve E serves as a guide for the pressure member when the pressure member and sleeve are in their extended position. The latter is designed' to be .frictionally held in any one of its indicating positions after the vplunger is retracted. In order that the'frictional grip may be as uniform as possible under varying conditions of use we preferably provide an expanding lmetallic friction ring p which is shown as confined within a. groove .formed in the lower end of the sleeve. rll`his friction ring is formed of `sition corresponding to the pressure.

This enables and to provide suitable packings at proper points, all of which are compressed by the screwing in of the hollow plug b. Vhen the latter is tightly in place leakage is prevented at the various joints.

In opera-tion the device is pressed down over the open end of a tire valve, and the deflating pin of the latter is thereby depressed and the air under pressure within the tire rushes into the expansion chamberV B. Its momentum is sufliciently checked and its flow through the small passage i into the pressure chamber C is sufficiently retarded to cause a steady increase of pressure within the pressure chamber, thus moving the pressure member D against the tension of its spring until the pressures within the pressure chamber and tire are equalized and the indicating member E rises to a rlpogauge is then removed to facilitate thel reading and the pressure member D, being no longer upheld by the pressure, is retracted by its spring leaving, however, the indicating member E in position to which it was previously moved. As is shown iniFig. Q the member E is preferably provided with a scale, the top of the casing 'of the construction shown serving as a pointer. IVhen the indication is read the member E is pushed down by hand to its lowermost. position, and the gauge is then ready to be againv used.v

In Figures 5, 6, 7, 8 and 9 we have shown several forms of packing which are suitable `for the member D. In Fig. 5 a tapering plug t is provided'which moves upwardly under pressure thus expanding the washer. In Fig. 6 a plain plug e -is used which sea-ts against a flat face on the plunger D. The plug o is carried upwardly by the pressure and downwardly by the member D. In Fig. 7 the underface of the member D is concaved so that it partially receives a thin packing disc w, while in Figure 8y it is convexed at its lower end and the packing disc a' follows its contour. In Fig. 9 the member Dis provided with a pivot having a conical or tapering portion z/ while a plate e sliding,r on the pin has a corresponding tapering .port-ion. The pressure on the under side of other constructions may be adopted which saiddpressure-responsive other suitable means.

l indicators which rior indicating comprising a tubular v mating Vthe length or'y 1 tion. F or instance, the indicating member E may be held in its indicating positions through any other -frictional means than that described, or it may be so held by any Furthermore, the eX- pansion chamber B may be constructed in any desirable manner, and maybe employed with good results Wherever analogous conditions prevail. For instance. vin pressure of a pump coupling it has been found in practice that the strokes of the pump produce corresponding pulsations of the air in the gauge and these pulsations cause a jumping or fluctuating of the indicating member. The provision. of an expansion chamber in this type of gauge prevents such' l pulsating movements. Other modifications and uses of the features of our invention will suggest themselvesto those skilled in the art.

What we claim is l. A portable gauge for pneumatic tires, comprising a casing. an interior indicating member slidable within said casing. a pressure-responsive member, said interior indicating member being adapted, to be moved to indicating position by said pressureresponsive member, and remain in said indicating pressure-resl'ionsive memberretract without position. said being free to carrying with it said intemember, means for detachably connecting said gauge to a tire valve, and a depressor for the tire valve.

2. A portable gauge for pneumatic tires,

comprising a Itubular casing.-a longitudinally movable pressure-responsive member, said pressure-responsive member being elongated and approximating in length the length of said casing, an elongated indicating member of a length approximating the I length of said casing, yand adapted to telescope therewith, said indicating member being adapted to be moved to indicating position byv said pressure-responsive member, and being adapted to remain, insaid indicating position, said pressure responsive member being free to retract without carryingyvith it said lindicatingmembei,means for detachably connecting said gauge to a tire valve, and a depressor` for the tire valve.

3. A portable gauge casing, a longitudinally movable pressure-responsive member, member being elon-y gate and approximating in llength the length of said casing, an elongated tubular indicating member telescopically slidable with relation to said casing, dicating member being of a length approxisaid casing. said tilbuar indicating member being adapted to be are intended to form a part.l

being adapted tofor pneumatic tires,

moved to indicating position by said pressure-responsive member, and being adapted to remain in said indicating position, said pressure-responsive retract without carrying with it said tubular indicating member, means for detachably connecting said gauge to atire valve, and a depressor for the tire valve.

4. A portable gauge for pneumatic tires, comprising a tubular casing, a longitudinally movable said pressure responsive-member being elon' gated and approximating in length the length of said casing, an elongated interior tubular indicating member telescopic'ally slidable Within said casing, said tubular--in dicating member being of a length approxi# moved to indicating position by said pre-ssure-responsive member, and being adapted to remain in said indicating position, saidv to actuate said indicating sleeve` and means for detacliably connecting said gauge to a i tire valve.

6. A portable gauge for pneumatic tires, comprising a casing, a pressure cylinder in side ot said casing,

also being movable independently dicating sleeve. and means for detachably connecting said gauge to a tire valve.

7 A fluid pressure gauge comprising a casing, `a pressure-responsive member .in said casing, an elongated indicating sleeve slidable with reference to the casing, said pressure-responsive member entering Within said sleeve and bearing against the outer end thereof and said sleeve being adapted to extend beyond thecasing in use.

8'. A Huid pressure gauge comprising a casing, a pressure-responsive member in said casing, a spring for loading saidpressureresponsive member also in said casing, and an indicating sleeve movable independently of the'pressure-responsive member yarranged vvithin'the casing between said spring and the casing and surrounding said spring.

i pressure gauge comprising a tubular casing. a tubular indicating sleeve movable longitudinally ofthe casing to a position where it extends longitudinally beyond the casing, and a pressure-responsive member vmemberv being free to f pressure-responsive member,r

v dicating member said pressure-responsive member beyond the Iend of the casing.-

10. In a pressure gauge for pneumatic tires, the combination of a casing constructed to be applied to the valve caslng of a tire. a spring resisted piston mounted within the casing so as to be acted upon by air transmitted from the-tire, and a gauge member slidable within 4the casing in the same direction as they piston and having a portion adapted to be engaged by the piston when the latter is movedoutwardly, the piston being adapted to return tonormal position independently of said member.

11. A pressure 'gauge comprising an air cylinder having a part to enga e a tire valve or the like, a pressure responsive lelement in said cylinder, an independent and free registering devicel separate from the pressure responsive element projectingslidably into said cylinder and adapted to contact with said pressure lresponsive element in its various actuated positions.

12. A pressure gauge for pneumatic vtires comprising acasing',- a pressure responsive member movable Within the interior of said casing, a;V tubular indicating member of a length greater than the normal movements of said pressure-responsive member, said inbeing movable to positions of greater or less projection from the casing, and being unconnected to said pressure-responsive member, and frictional means for holding said indicating member in vits various indicating positions.

13. A presure gauge for pneumatic tires comprising a casing, a pressure-responsive member. a tubular indi-eating member arranged exteriorly'of said pressure-responsive member and being of a length greater than the normal movements of said pressure-responsive member, said indicating member being movable to positions of greater or less projection from the casing, and being unconnected to said pressure-responsive member, and frictional means for holding-said indicating member in its various indicating positions.

14. A portable gauge for` pneumatic tires comprising a tubular casing having a presson seat for quick application to a ltire valve,

a depressor for opening such valve, a springresisted pressure-responsive member Amovpressure required to move it is-a. negligible,

fraction of the pressure exerted to move the 'pressure-responsive member, While such friction is sufficient to reliably hold the indicating 'member stationary in any position in which it may be left, so that its indication can be observed afterl the removal of the gaugel from the tire valve.

l5. A portable gauge for pneumatic tires comprising a tubular casing having a presson seat for quick application to a tire valve, a. depressor for opening su-ch valve, a springresisted pressure-responsive member movable longitudinally Within the casing'upon the admission of air thereto through said seat, the gauge having a relatively large air-chamber between the seat and pressureresponsive member, and arestrictedI orifice opening thereinto, whereby the air entering from the valve shall be so choked as to build up the pressure in said chamber gradually. and avoid any sudden movement vof the lpressure-responsive member such as to carry it beyond the position due to the air-pressure, so that over-registering is avoided.

16. A gauge comprising an elongated casing, an indicating sleeve telescoping with said casing and in indicating positions extending beyond said casing, and pressure-responsive means arranged within the gauge and adapted on pressure to move said indicating sleeve to its extended indicating positions, said sleeve sliding along the interior of said casing and being disconnected vfrom said pressure-responsive member so that it moves only outwardly therewith.

i In witness whereof we havehereunto signed our names inthe presence of two subscribing witnesses.

. MAXIMILIAN CHARLES SCHWEINERT.

HENRY P. KRAFT.

Witnesses:

EUGENE V. MYERS, FRED `WHITE. 

